Fremont LLC is looking to purchase new water chlorination equipment. A salesman from Industrial Water Services (IWS) offered water chlorination equipment for $2.1 million. IWS also said that Fremont LLC would not have to pay for the equipment now and can pay after 2 years. While the price offered by a competing saleswoman from AG Enterprises is $1.7 million to be paid now. Fremont LLC's real MARR is 12% per year, and the inflation rate is 3.9% per year. What is the overall interest rate? (If needed, Round-off to nearest whole number) 4% 12% 16% Unknown